Hogy lehet internetes űrlapot kitölteni C#-pal?

Ó, ez sokkal egyszerűbb...csak el kell post-olni a megfelelő adatokat. A HttpWebRequest osztályt nézd meg.

Pl:

private static string downloadPage(string url, string post, Encoding encoding)

{

HttpWebRequest req;

StreamReader respstrm;

string response = null;

try

{

req = (HttpWebRequest)WebRequest.Create(url);

req.UserAgent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; .NET CLR 1.0.3705)";

if (post != null)

{

StreamWriter requestWriter;

req.Method = "POST";

req.ContentType = "application/x-www-form-urlencoded";

requestWriter = new StreamWriter(req.GetRequestStream());

requestWriter.Write(post);

requestWriter.Close();

}

respstrm = new StreamReader(req.GetResponse().GetResponseStream(), encoding);

response = respstrm.ReadToEnd();

respstrm.Close();

}

catch (IOException) { }

catch (WebException) { }

return response;

}

string response = downloadPage(" [link] "Username=" + username + "&Password=" + password, Encoding.UTF8);